JP4939259B2 - Acoustic device and sound correction method - Google Patents

Description

  The present invention relates to an acoustic device and a sound correction method.

  Conventionally, various electric components are mounted on a moving body such as a vehicle and are used by users. As one of such electrical components, there is a car audio device that is an acoustic device mounted on a car. In such a car audio device, a reproduction sound such as music is output to a vehicle interior space from a speaker arranged at a predetermined position. A listener in the vehicle listens to the sound output from the speaker.

  By the way, when the vehicle is traveling, traveling noise such as engine noise and wind noise is generated, and the environment for listening to reproduced sound in the vehicle deteriorates. Such traveling noise varies depending on the engine speed, road surface condition, window open / closed condition, and the like.

  In order to respond to such driving noise and provide the listener with a favorable listening environment, the noise level in the vehicle (hereinafter also referred to as “noise noise”) or the amount corresponding to the noise level is measured. Techniques have been proposed for adjusting the output volume from a speaker based on the measurement result (see, for example, Patent Documents 1 and 2: hereinafter referred to as “conventional example”). In such a conventional technique, the higher the noise level, the higher the output volume from the speaker.

JP-A-57-41014 JP-A-7-94985

  In the conventional example described above, the sound pressure of the sound output from the speaker decreases as the distance from the speaker increases, so that the sound output from the speaker is suitable for a listener away from the speaker. When the volume is adjusted, the volume is excessive for the listener who is close to the speaker.

  On the other hand, when the output volume from the speaker is adjusted so that the volume level is appropriate for the listener who is close to the speaker, the volume is too low for the listener who is far from the speaker. When such a volume adjustment is performed, it becomes difficult to hear a voice related to a person's utterance such as a speech at a position where the volume is too low.

  For this reason, there is a technology that enables both a listener far from the speaker and a listener close to the speaker to clearly and comfortably hear speech related to a person's utterance such as speech sounds. Long-awaited. Meeting this requirement is one of the problems to be solved by the present invention.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a new acoustic device and a sound correction method capable of appropriately correcting sound according to a listening position.

The invention according to claim 1 is presumed to correlate with a main sound output means for outputting a sound toward a normal listening position in a predetermined space; and a consonant component of a sound output from the main sound output means. Extraction means for extracting a specific component; a sound output position is set closer to the specific listening position in the predetermined space than the sound output position of the main sound output means, and the sound is output toward the specific listening position Sub sound output means; extracted by the extraction means at a sound output timing and volume determined based on a positional relationship among the sound output position of the main sound output means, the sound output position of the sub sound output means, and the specific listening position. Sound correction means for outputting the sound of the selected component from the sub sound output means; noise measurement means for measuring a noise level in the predetermined space; and the sound correction means includes the sub sound output means. Sound from the sub sound output means so as to reach the specific listening position later than the sound of the specific component output from the main sound output means corresponding to the sound having the specific component output from the stage. The output timing is controlled, and the sound volume at the specific listening position of the sound having the specific component output from the sub sound output means is set to the specific listening position of the sound of the specific component output from the main sound output means. By controlling the volume from the sub-sound output means so as to be smaller than the volume in the, and adjusting the volume level output from the main sound output means based on the measurement result by the noise measurement means, The volume of a specific component in the sound output from the sub sound output means at the specific listening position by adjusting the volume near the normal listening position The volume of the specific component in the sound output from the main sound output means at the specific listening position does not exceed the volume of the specific component in the sound output from the main sound output means. And a volume level output from the sub sound output means within a range not exceeding a difference between the volume at the specific listening position and the volume at the specific listening position .

According to a fifth aspect of the present invention, there is provided a main sound output step of outputting a sound from the main sound output means toward a normal listening position in a predetermined space; and a correlation with a consonant component of the sound output from the main sound output means An extraction step of extracting a specific component estimated to be present; a sound output position is set closer to the specific listening position in the predetermined space than the sound output position of the main sound output means; sound output position of the sub-sound output means for outputting sound Te, the sound output timing and volume determined based on the positional relationship of the sound output position and the specific listening position of the main sound output unit, the sub-sound of the specific component a correction sound output step of outputting from the sound output means; equipped with, in the correction sound output process, output from the main sound output means corresponding to the sound with a specified component output from the sub-sound output means The sound output timing from the sub sound output means is controlled so as to arrive at the specific listening position later than the sound of the specific component, and the specific component output from the sub sound output means is included. Controlling the volume from the sub sound output means so that the volume of the sound at the specific listening position is smaller than the volume at the specific listening position of the sound of the specific component output from the main sound output means, Adjusting the volume level near the normal listening position by adjusting the volume level output from the main sound output means based on the measurement result by the noise measurement means for measuring the noise level in the predetermined space, and the specific The volume of the specific component in the sound output from the sub sound output means at the listening position is the main sound at the specific listening position. A volume that does not exceed the volume of the specific component in the sound output from the force means, and the volume at the normal listening position and the volume at the specific listening position of the specific component in the sound output from the main sound output means In the audio correction method, the volume level output from the sub sound output means is adjusted within a range not exceeding the difference .

A sixth aspect of the present invention is a voice correction program that causes a calculation means to execute the voice correction method according to the fifth aspect.

A seventh aspect of the present invention is a recording medium in which the audio correction program according to the sixth aspect is recorded so as to be readable by a calculation means.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the following description, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.

[Constitution]
FIG. 1 is a block diagram illustrating a configuration of an audio device 100 according to an embodiment. The acoustic device 100 is an acoustic device mounted on a vehicle CAR (see FIG. 2), and includes a control unit 110 and a storage device 120 as shown in FIG. The acoustic device 100 also includes a main sound output unit 130M as main sound output means, a sub sound output unit 130S as sub sound output means, and a sound collection unit 140 as part of noise measurement means. . Furthermore, the acoustic device 100 includes a display unit 150 and an operation input unit 160.

  Elements 120 to 160 other than the control unit 110 are connected to the control unit 110.

The storage device 120 includes a fixed disk device, a DVD drive device in which a DVD (Digital Versatile Disk) is inserted, and the like. The storage device 120 includes various data necessary for the operation of the audio device 100, including sound data (hereinafter referred to as "sound content data") 121 ₁ , 121 ₂ ,. Data is stored. The control unit 110 can access a storage area of the storage device 120, and can write data into the storage area and read data from the storage area.

  The main sound output unit 130M includes (i) a DA converter (Digital to Analog Converter) that converts digital audio data received from the control unit 110 into an analog signal, and (ii) an analog signal output from the DA converter. It comprises an amplifier that amplifies, and (iii) a speaker 131M that converts the amplified analog signal into sound. The main sound output unit 130 reproduces and outputs guidance voice, music, and the like under the control of the control unit 110.

  The sub sound output unit 130S is configured in substantially the same manner as the main sound output unit 130M. That is, the sub sound output unit 130S includes (i) a DA converter (Digital to Analog Converter) that converts digital audio data received from the control unit 110 into an analog signal, and (ii) an analog output from the DA converter. It comprises an amplifier that amplifies the signal and (iii) a speaker 131S that converts the amplified analog signal into sound. The main sound output unit 130M reproduces and outputs guidance voice, music, and the like under the control of the control unit 110.

  In the present embodiment, as shown in FIG. 2, the speaker 131M of the main sound output unit 130M is disposed in front of the sound field space ASP in the vehicle CAR, for example, in the dashboard. Further, the speaker 131S of the sub sound output unit 130S is disposed on the upper left side of the backrest of the driver's seat. In this embodiment, the position P1 of the left ear of the listener LSN1 seated in the driver's seat in the sound field space ASP in the vehicle is the normal listening position, and the listener LSN2 seated in the rear seat on the driver's seat side. It is assumed that the position P2 of the left ear is a specific listening position. It is desirable that the condition that the distance between the speaker 131S and the specific listening position P2 is ½ or less of the distance between the speaker 131M and the specific listening position P2. In the present embodiment, this condition is satisfied.

  Returning to FIG. 1, the sound collection unit 140 includes (i) a microphone that collects ambient sounds and generates an electrical analog audio signal, (ii) an amplifier that amplifies the analog audio signal output from the microphone, and (iii) An AD converter (Analog to Digital Converter) that converts an amplified analog audio signal into a digital audio signal is provided. Here, the microphone is disposed at a predetermined noise detection position in the sound field space ASP. The sound collection result by the sound collection unit 140 is reported to the control unit 110.

  The display unit 150 displays (i) a display device such as a liquid crystal display panel, an organic EL (Electro Luminescence) panel, or a PDP (Plasma Display Panel), and (ii) a display control data sent from the control unit 110. The display unit includes a display controller such as a graphic renderer that controls the entire unit 150, and (iii) a display image memory that stores display image data. The display unit 150 displays operation guidance information and the like under the control of the control unit 110.

  The operation input unit 160 is configured by a key unit provided in the main body of the audio device 100 or a remote input device including the key unit. Here, as a key part provided in the main body part, a touch panel provided in a display device of the display unit 150 can be used. In addition, it can replace with the structure which has a key part, and the structure which inputs voice can also be employ | adopted.

  When the user operates the operation input unit 160, the operation content of the acoustic device 100 is set. For example, the user uses the operation input unit 160 to set the playback music, search for music, and the like. Such input contents are sent from the operation input unit 160 to the control unit 110.

  The control unit 110 performs overall control of the audio device 100. As shown in FIG. 3, the control unit 110 includes a digital sound data generation unit 210 and a level adjustment unit 220M. The control unit 110 includes a sub sound extraction unit 230 as an extraction unit, a delay unit 240 as a part of the audio correction unit, and a level adjustment unit 220S as a part of the audio correction unit. Furthermore, the control unit 110 includes a noise level detection unit 250 as a part of the noise measurement unit.

When the operation input unit 160 reports that the sound content to be reproduced has been designated, the digital sound data generator 210 generates sound content data 121 _j (j = 1, _j) corresponding to the sound content to be reproduced. 2,...) Is read out from the storage device 120 as data ACD and expanded to generate digital sound data ADD. Then, the digital sound data generation unit 210 sends the generated digital sound data ADD to the level adjustment unit 220M and the sub sound extraction unit 230.

  The level adjustment unit 220M amplifies or attenuates the volume level of the digital sound data ADD received from the digital sound data generation unit 210 to generate main output sound data MAD. The amplification factor or attenuation factor of the amplification or attenuation is determined by the level adjustment unit 220M according to the detection result DNL from the noise level detection unit 250.

The level adjustment unit 220M sends the generated main output sound data MAD to the main sound output unit 130M. As a result, the sound content stored in the storage device 120 as the sound content data 121 _j is reproduced and output from the speaker 131M of the main sound output unit 130M toward the sound field space ASP.

  In the present embodiment, the level adjustment unit 220M adjusts the volume level so that sound is output from the speaker 131M at a volume that provides an appropriate volume feeling in the vicinity of the normal listening position P1. Note that the level adjustment mode based on the detection result DNL from the noise level detection unit 250 in the level adjustment unit 220M is determined in advance based on a prior experiment, a prior simulation, experience, or the like.

  The sub sound extraction unit 230 extracts a specific component estimated to have a correlation with a consonant component in the digital sound data ADD received from the digital sound data generation unit 210. In the present embodiment, as the specific component, a component in a continuous frequency range including the third formant frequency and the fourth formant frequency in the sound when the digital sound data ADD is reproduced and not including the second formant frequency is extracted. It has come to be. As shown in FIG. 4, the sub sound extraction unit 230 includes a spectrum analysis unit 231 and a filter unit 232.

  Based on the digital sound data ADD, the spectrum analysis unit 231 obtains a frequency distribution of sound volume in the sound when the digital sound data ADD is reproduced. An example of the frequency distribution thus obtained is shown in FIG.

  The spectrum analysis unit 231 obtains sub sound extraction information based on the obtained frequency distribution. In this embodiment, when obtaining the sub sound extraction information, first, first to third formant frequencies F1 to F3 are extracted (see FIG. 5). Subsequently, the spectrum analysis unit 231 determines a threshold value that is a frequency between the second formant frequency F2 and the third formant frequency F3 based on the extracted second formant frequency F2 and third formant frequency F3 and the frequency distribution. The frequency FTH is obtained (see FIG. 5). Returning to FIG. 4, the spectrum analysis unit 231 sends the obtained threshold frequency FTH to the filter unit 232 as sub sound extraction information ERF.

  In the present embodiment, the frequency at which the volume is minimum between the second formant frequency F2 and the third formant frequency F3 is obtained as the threshold frequency FTH (see FIG. 5).

  The filter unit 232 extracts a specific component from the digital sound data ADD in accordance with the sub sound extraction information ERF from the spectrum analysis unit 231. Then, the filter unit 232 sends the extraction result to the delay unit 240 as extraction data ERD.

  In the present embodiment, the filter unit 232 is configured as a variable high-pass filter that passes the sub sound extraction information ERF, that is, a frequency component equal to or higher than the threshold frequency FTH. FIG. 6 shows an example of the frequency distribution of sound when the extracted data ERD extracted by the filter unit 232 configured as such a variable high-pass filter is reproduced.

  Returning to FIG. 3, the delay unit 240 receives the extraction data ERD from the sub sound extraction unit 230 and delays it by a predetermined delay time TD to generate the delay sound data DAD. Here, the delay time TD indicates that the sound output from the speaker 131S of the sub sound output unit 130S is at the specific listening position than the time when the sound output from the speaker 131M of the main sound output unit 130M reaches the specific listening position P2. It is determined in advance so that the time to reach P2 is slightly delayed. That is, the delay time TD is the difference between the distance from the speaker 131M of the main sound output unit 130M to the specific listening position P2 and the distance from the speaker 131S of the sub sound output unit 130S to the specific listening position P2, and the sound field space. It is determined in advance in the design stage based on the minimum temperature assumed during sound listening in the ASP. Information on the delay time TD is incorporated in the delay unit 240.

  The level adjustment unit 220S amplifies or attenuates the volume level of the delay sound data DAD received from the delay unit 240, and generates sub output sound data SAD. The amplification factor or attenuation factor of the amplification or attenuation includes the distance from the speaker 131M of the main sound output unit 130M to the specific listening position P2, the distance from the speaker 131S of the sub sound output unit 130S to the specific listening position P2, and the noise level. The level adjustment unit 220S determines the detection result DNL from the detection unit 250.

  The level adjustment unit 220S performs volume adjustment from the viewpoint of realizing an appropriate volume feeling and clarity. Such a volume adjustment mode is determined in advance based on a prior experiment, a prior simulation, an experience, or the like. In the present embodiment, in the level adjustment unit 220S, the volume of the specific component in the sound output from the speaker 131S at the specific listening position P2 does not exceed the volume of the specific component in the sound output from the speaker 131M at the specific listening position P2. The sub output sound data SAD is within a range and does not exceed the difference between the volume at the normal listening position P1 and the volume at the specific listening position P2 of the specific component in the sound output from the speaker 131M of the main sound output unit 130M. The volume level is adjusted.

  The level adjustment unit 220S sends the generated sub output sound data SAD to the sub sound output unit 130S. As a result, the sound of the specific component of the sound output from the speaker 131M is output from the speaker 131S of the sub sound output unit 130S toward the sound field space ASP at a volume corresponding to the detection result by the noise level detection unit 250. .

  The noise level detection unit 250 detects the noise level around the noise detection position based on the sound collection data AAD from the sound collection unit 140. Since the noise level around the noise detection position and the noise level in the sound field space ASP in general have a correlation, the noise level around the noise detection position is detected to detect the noise level in the sound field space ASP. The noise level in general can be estimated. Such correlation differs depending on the vehicle type having the sound field space ASP as the vehicle interior space, but is assumed to be obtained in advance by experiments, simulations, and the like.

  In the present embodiment, the noise level detector 250 is not usually included in the sound output from the main sound output unit 130M or the sub sound output unit 130S, or even if it is included, Based on the power in the sound collection data AAD, the noise level around the noise detection position is detected. As described above, the detection result by the noise level detection unit 250 is sent to the level adjustment units 220M and 220S as the detection result DNL.

[Operation]
Next, the operation of the acoustic device 100 configured as described above will be described mainly focusing on the correction processing of volume feeling and clarity.

  In the acoustic device 100, when energization is started, the sound collecting operation by the sound collecting unit 140 and the noise level detecting operation at the noise detection position by the noise level detecting unit 250 are started. And the said detection operation is continued over an electricity supply period.

When the user inputs the designation of the sound content to be reproduced to the operation unit 160, the operation unit 160 reports that fact to the control unit 110. In the control unit 110 that has received this report, first, the digital sound data generation unit 210 converts the sound content data 121 _j (j = 1, 2,...) Corresponding to the designated sound content from the storage device 120 as data ACD. read out.

Subsequently, the digital sound data generation unit 210 expands the read sound content data 121 _j to generate digital sound data ADD. The digital sound data ADD thus generated is sent from the digital sound data generation unit 210 to the level adjustment unit 220M and the sub sound extraction unit 230.

  Upon receiving the digital sound data ADD from the digital sound data generation unit 210, the level adjustment unit 220M amplifies or attenuates the volume level of the digital sound data ADD in accordance with the detection result DNL from the noise level detection unit 250, and outputs the main output sound. Data MAD is generated. When generating the main output sound data MAD, the level adjustment unit 220M refers to the detection result DNL from the noise level detection unit 250, and from the speaker 131M with a sound volume that is appropriate and clear in the vicinity of the normal listening position P1. The volume level of the main output sound data MAD is adjusted so that the sound output is performed.

  The main output sound data MAD generated as described above is sent from the level adjustment unit 220M to the main sound output unit 130M. The main sound output unit 130M that has received the main output sound data MAD reproduces the main output sound data MAD and outputs it from the speaker 130M toward the sound field space ASP. The sound output from the speaker 131M propagates in the sound field space ASP and is heard by a listener in the sound field space ASP.

  As a result of the sound reproduction of the main sound output unit 130M performed as described above, the listener LSN1 at the normal listening position P1 can always listen to the sound output from the speaker 131M with almost appropriate volume and clarity. it can. On the other hand, the listener LSN2 who listens at the specific listening position P2 feels that the sound is insufficient only with the sound output from the speaker 131M, and lack of clarity when the sound is voice related to human speech. In particular, when the noise level increases, a lack of sound volume and a lack of clarity become noticeable.

  In parallel with the generation of the main output sound data MAD by the level adjustment unit 220M and the sound output operation by the main sound output unit 130M, the digital sound data ADD is obtained by the sub sound extraction unit 230, the delay unit 240, and the level adjustment unit 220S. The sub sound output data SAD is generated based on the sound and the sound output operation by the sub sound output unit 130S is performed. In this operation, first, the sub sound extraction unit 230 that has received the digital sound data ADD from the digital sound data generation unit 210 extracts a specific component from the digital sound data ADD.

  In the extraction of the specific part, in the sub sound extraction unit 230, first, the spectrum analysis unit 231 obtains the frequency distribution of the sound volume when the digital sound data ADD is reproduced based on the digital sound data ADD (FIG. 5). Subsequently, the spectrum analysis unit 231 obtains the sub sound extraction information ERF based on the obtained frequency distribution. In the present embodiment, as described above, after the spectrum analysis unit 231 extracts the first to third formant frequencies F1 to F3, the extracted second formant frequency F2 and third formant frequency F3, and the frequency distribution are extracted. Based on the above, a threshold frequency FTH that is a frequency between the second formant frequency F2 and the third formant frequency F3 is obtained as the sub sound extraction information ERF (see FIG. 5). Then, the spectrum analyzing unit 231 sends the obtained sub sound extraction information ERF to the filter unit 232.

  The filter unit 232 that has received the sub sound extraction information ERF extracts a specific component from the digital sound data ADD in accordance with the sub sound extraction information ERF. In the present embodiment, the filter unit 232 extracts the sub sound extraction information ERF, that is, the frequency component equal to or higher than the threshold frequency FTH, so as to extract the specific component from the digital sound data ADD. Then, the filter unit 232 sends the extracted characteristic component to the delay unit 240 as extracted data ERD (see FIG. 6).

  Upon receiving the sub sound data ERD, the delay unit 240 delays the sub sound data ERD by the delay time TD to generate the delay sound data DAD. The delay sound data DAD generated in this way is sent to the level adjustment unit 220S. Since the delay time TD is determined as described above, the sub sound output unit 130S is more effective than the time when the specific component of the sound output from the speaker 131M of the main sound output unit 130M reaches the specific listening position P2. The time at which the sound of the specific component output from the speaker 131S reaches the specific listening position P2 is slightly delayed.

  The level adjustment unit 220S that has received the delay sound data DAD from the delay unit 240, as described above, considers the detection result DNL from the noise level detection unit 250, and outputs the sound output from the speaker 131S at the specific listening position P2. The volume level is adjusted so as to improve the volume and clarity of the listener at the specific listening position P2 in a range that does not exceed the volume of the specific component of the sound output from the speaker 131M at the specific listening position P2. Sub output sound data SAD is generated. The sub output sound data SAD generated in this way is sent from the level adjustment unit 220S to the sub sound output unit 130S.

  The sub sound output unit 130S that has received the sub output sound data SAD reproduces the sub output sound data SAD and outputs it from the speaker 131S toward the sound field space ASP. The sound output from the speaker 131S propagates in the sound field space ASP and is heard by the listener LSN2 in the sound field space ASP.

  As a result, the listener LSN2 at the specific listening position P2 outputs a sound using the main sound output unit 130M as an output source and a sound using the sub sound output unit 130S for improving the lack of volume and clarity. Both will be heard.

  As described above, in the present embodiment, the sub-volume is directed toward the specific listening position P2 where the sound volume is insufficient at the output volume from the main speaker 131M that produces an appropriate volume feeling and clarity at the normal listening position P1. From the speaker 131S, the sound of the specific component estimated to have a correlation with the consonant component is output at a volume determined from the viewpoint of supplementing the lack of volume and clarity. For this reason, it is possible to improve the sense of volume and clarity of the listener at the specific listening position P2 while reducing the proximity sound pressure due to the sound output from the speaker 131S.

  In the present embodiment, the sound of the specific component output from the sub speaker 131S arrives at the specific listening position P2 later than the sound output from the main speaker 131M. The output timing of the sound of the specific component is adjusted. For this reason, the so-called preceding sound effect can further reduce the proximity sound compression and contribute to the maintenance of the sensation regarding the sound output direction.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, and various modifications are possible.

  For example, in the above embodiment, the speaker 131M of the main sound output unit 130M is disposed in front of the sound field space ASP in the vehicle CAR, and the speaker 131S of the sub sound output unit 130S is a backrest of the driver's seat. Although arranged on the upper left side, the speaker 131M and the speaker 131S may be arranged at other positions.

  In the above embodiment, the main sound output unit 130M has only the speaker 131M. However, for example, the main sound output unit is a sound output unit in a 5.1ch surround system, and a line in the 5.1ch surround system is used. A sub sound output unit can be prepared corresponding to the center speaker to which the sound output is assigned.

  In the above-described embodiment, the filter unit 232 is configured as a variable high-pass filter. However, the filter unit 232 may be configured as a variable band-pass filter that can vary a frequency range to be passed. In this case, the spectrum analysis unit 231 has a predetermined frequency range that includes the third formant frequency F3 and the fourth formant frequency F4 (see FIG. 5) and does not include the second formant frequency F2. The minimum frequency value and the maximum frequency value in the frequency range may be calculated according to the method and reported to the filter unit 232 as the sub sound extraction information ERF.

  A navigation device or the like that is mounted on a vehicle and also functions as an audio device may have the function of the audio device 100 of the present embodiment.

  In the above embodiment, the present invention is applied to an acoustic device mounted on a vehicle. However, the present invention can also be applied to an acoustic device mounted on a moving body other than the vehicle. The present invention can also be applied to an acoustic device that is not mounted on the body.

  In addition, the control unit 110 in the above embodiment includes a central processing unit (CPU), a DSP (Digital Signal Processor), a read only memory (ROM), and a random access memory (RAM). It is also possible to configure the computer as a computing means including the above, and execute the processing in the above-described embodiment on a computer prepared in advance. This program is recorded on a computer-readable recording medium such as a hard disk, CD-ROM, or DVD, and is read from the recording medium and executed by the computer. The program may be acquired in a form recorded on a portable recording medium such as a CD-ROM or DVD, or may be acquired in a form of delivery via a network such as the Internet. Also good.

1 is a block diagram schematically showing a configuration of an audio device according to an embodiment of the present invention. It is a figure for demonstrating the arrangement position of the speaker of the main sound output unit of FIG. 1, and the speaker of a sub sound output unit. It is a block diagram for demonstrating the structure of the control unit of FIG. It is a block diagram for demonstrating the structure of the sub sound extraction part of FIG. It is a figure for demonstrating the frequency distribution of the sound which reproduced | regenerated the data output from the digital sound data generation part of FIG. It is a figure for demonstrating the frequency distribution of the sound which reproduced | regenerated the extraction result by the sub sound extraction part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Sound apparatus 130M ... Main sound output unit (main sound output means)
130S: Sub sound output unit (sub sound output means)
140 ... Sound collecting unit (part of noise measuring means)
220S ... Level adjustment unit (part of sound correction means)
230 ... Sub sound extraction unit (extraction means)
240 ... delay unit (part of sound correction means)
250 ... Noise level detector (part of noise measurement means)

Claims (7)

Main sound output means for outputting sound toward a normal listening position in a predetermined space;
Extraction means for extracting a specific component estimated to be correlated with a consonant component of the sound output from the main sound output means;
Sub sound output means for setting the sound output position closer to the specific listening position in the predetermined space than the sound output position of the main sound output means, and outputting the sound toward the specific listening position;
The sound of the component extracted by the extraction means at the sound output timing and volume determined based on the positional relationship among the sound output position of the main sound output means, the sound output position of the sub sound output means, and the specific listening position Audio correction means for outputting from the sub sound output means;
A noise measuring means for measuring the noise level in the predetermined space; equipped with,
The sound correcting means is
The sub sound output so as to reach the specific listening position later than the sound of the specific component output from the main sound output means corresponding to the sound having the specific component output from the sub sound output means While controlling the sound output timing from the means,
The volume at the specific listening position of the sound having the specific component output from the sub-sound output means is set to be smaller than the volume at the specific listening position of the sound of the specific component output from the main sound output means. To control the volume from the sub sound output means,
Based on the measurement result by the noise measurement means,
By adjusting the volume level output from the main sound output means, the volume near the normal listening position is adjusted,
The volume of the specific component in the sound output from the sub sound output means at the specific listening position is in a range not exceeding the volume of the specific component in the sound output from the main sound output means at the specific listening position, and The volume level output from the sub-sound output means is adjusted within a range that does not exceed the volume of the specific component in the sound output from the main sound output means at the normal listening position and the volume at the specific listening position. To
An acoustic device characterized by that.   The specific component is a component in a continuous frequency range including the third formant frequency and the fourth formant frequency in the sound output from the main sound output unit and not including the second formant frequency. The acoustic device according to claim 1. The sound output position of the sub-sound output means, according to claim 1 or 2 wherein the sound output position of the main sound output unit is set in the vicinity of a line connecting the specific listening position, characterized in that Acoustic device. The acoustic device according to any one of claims 1 to 3 , wherein the acoustic device is mounted on a moving body, and the predetermined space is an internal space of the moving body. A main sound output step of outputting a sound from the main sound output means toward a normal listening position in a predetermined space;
An extraction step of extracting a specific component estimated to be correlated with a consonant component of the sound output from the main sound output means;
A sound output position of the sub sound output means for setting the sound output position to a position closer to the specific listening position in the predetermined space than the sound output position of the main sound output means, and outputting the sound toward the specific listening position; in the sound output timing and volume determined based on the positional relationship of the sound output position and the specific listening position of the main sound output unit, and a correction sound output step of outputting a sound of the specific component from the sub-sound output unit; includes a ,
In the corrected sound output step,
The sub sound output so as to reach the specific listening position later than the sound of the specific component output from the main sound output means corresponding to the sound having the specific component output from the sub sound output means While controlling the sound output timing from the means,
The volume at the specific listening position of the sound having the specific component output from the sub-sound output means is set to be smaller than the volume at the specific listening position of the sound of the specific component output from the main sound output means. To control the volume from the sub sound output means,
Based on the measurement result by the noise measuring means for measuring the noise level in the predetermined space,
By adjusting the volume level output from the main sound output means, the volume near the normal listening position is adjusted,
The volume of the specific component in the sound output from the sub sound output means at the specific listening position is in a range not exceeding the volume of the specific component in the sound output from the main sound output means at the specific listening position, and The volume level output from the sub-sound output means is adjusted within a range that does not exceed the volume of the specific component in the sound output from the main sound output means at the normal listening position and the volume at the specific listening position. To
An audio correction method characterized by the above . An audio correction program for causing a calculation means to execute the audio correction method according to claim 5 . 7. A recording medium, wherein the audio correction program according to claim 6 is recorded so as to be readable by an arithmetic means.

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